Apple Watch Series 8 Aluminum vs Apple Watch Ultra

A2773, A2775, A2772, A2774, A2857, A2858

A2684, A2622, A2859

45 x 38 x 10.7 mm (1.77 x 1.50 x 0.42 in)

49 x 44 x 14.4 mm (1.93 x 1.73 x 0.57 in)

32 g (41mm), 38.8 g (45mm) (1.13 oz)

61.3 g (2.15 oz)

Glass front, ceramic/sapphire crystal back, aluminum frame IP6X certified 50m water resistant

Sapphire crystal front, ceramic/sapphire crystal back, titanium frame IP6X certified 100m water resistant (WR100) 40m swimproof/diving (EN13319) MIL-STD 810H certified

Midnight, Starlight, Silver, Red

Titanium

1.9 inches

1.92 inches

484 x 396 pixels

502 x 410 pixels

326 ppi density

338 ppi density

Always-on display 1000 nits (peak)

Always-on display 2000 nits (peak)

1 GB

Unspecified

Accelerometer, gyro, heart rate, barometer, always-on altimeter, compass, SpO2, VO2max, temperature (body) Temperature sensing (0.01˚ accuracy) Natural language commands and dictation (talking mode) Ultra Wideband (UWB) support

Accelerometer, gyro, heart rate, barometer, always-on altimeter, compass, SpO2, VO2max, temperature (body), temperature (water) Temperature sensing (0.01˚ accuracy) Depth gauge (±1m accuracy) Natural language commands and dictation (talking mode) Ultra Wideband (UWB) support

5.0, A2DP, LE

5.3, A2DP, LE

Yes, with A-GPS, GLONASS, GALILEO, QZSS, BDS

Yes, with dual-band A-GPS, GLONASS, GALILEO, BDS

308 mAh, Battery

542 mAh, Battery